Collars A and B slide along the fixed right-angle rods and are connected by a cord of length L = 6.8 m. Determine the acceleration of collar B when y = 2.7 m if collar A is given a constant upward velocity vA = 2.13 m/s. The acceleration of B is positive if to the right, negative if to the left.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?